HR: 1340h
AN: T13A-1348    [Abstracts]
TI: Airborne Gravity Gradiometer Survey Over the San Andreas Fault
AU: * Talwani, M
EM: mtalwani@iodp.org
AF: IODP-MI, 1899 L Street, NW, Washington, DC 20036 United States
AB: An airborne gravity gradiometer survey is being conducted over the San Andreas Fault drill site. The survey is over a 10km x 10km area. Forty lines will be flown in a direction parallel to the strike of topography; the lines, 250 meters apart, will each be 10km in length. Ten lines 1km apart will be flown in a perpendicular direction. The lines will be flown on a drape surface at a nominal ground clearance of 200 meters, although the ground clearance will be substantially greater in many parts of the survey because of the presence of steep topography. The principal objective of the survey is to detect density inhomogeneties associated with the San Andreas Fault which lie at a shallow depth (less than 1km). Terrain corrections are very large in the area of the survey and correct application of the corrections is essential for detection of sub-surface density variations. The survey will be carried out by Bell Geospace using its six component airborne gravity gradiometer. We expect to be able to present some preliminary results at this meeting.
DE: 1219 Local gravity anomalies and crustal structure
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting